I am dealing with time course extraction from preprocessed (prerpoc-sess) task functional data; I was able to extract the time courses from the fsaverage sampled surfaces fmcpr.up.sm3.fsaverage.lh.nii.gz thanks to mri_segstats, but I was wondering how to handle the data sampled to the MNI space fmcpr.up.sm5.mni305.2mm.nii.gz. I think I should run mri_vol2surf to get a surface but I don't get the kind of registration option should I use.
mri_vol2surf --src fmcpr.up.sm5.mni305.2mm.nii.gz